Generate TypeScript from JSON
Generate TypeScript types from JSON locally in the browser.
TypeScript interfaces will appear here...
WHY THIS TOOL EXISTS
Generate TypeScript Interfaces from JSON
Paste a JSON sample and turn it into TypeScript interfaces and type definitions without writing them by hand. The tool recursively processes nested objects and arrays to produce accurate type structures. It is useful for typing API response payloads, bootstrapping frontend data models, and quickly scaffolding types during prototyping.
Benefits: Instant interface generation from any valid JSON, recursive handling of nested objects and arrays, proper typing of strings, numbers, booleans, and null values, copy generated types to clipboard with one click, works entirely offline in your browser.
Best for: Typing REST API response payloads, bootstrapping frontend data models, rapid prototyping with real API data, replacing manual type writing during development, generating types from database query results, and onboarding to unfamiliar APIs by inspecting their response shapes.
Limitations and tradeoffs
- Generates a single root interface with inline types rather than separate named interfaces for nested objects
- Cannot infer optional fields or union types from a single JSON sample
- Empty arrays are typed as any[] since there is no element to infer the type from
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